ip₂/ip³¹/prt助词while sleeping睡觉发生| kaq vmaang ip.During the night we lost the chicken.（昨夜）鸡丢失了（我睡之前还在的）.| Action must have taken place at night, presumably when speaker was asleep, and was not directly witnessed.动作是在夜间发生的，兼表非亲见意义.与 ri 相比，强调是在说话人入睡后完成的.